Local Atomic Arrangements in Alloys and Intermetallics

合金和金属间化合物中的局部原子排列

• 批准号: 9224298
• 负责人: Jerome Cohen
• 金额: $ 30.99万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-04-01 至 1997-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9224298&HistoricalAwards=false
• 关键词: Local; Atomic; Arrangements; Alloys; Intermetallics

The role of coherency strains in phase formation is examined using sophisticated X-ray scattering techniques. The initial stages of phase formation involve formation of locally ordered regions or clusters. Coherency strains can affect the compositions of these clusters and modify the phase diagram. Lattice parameters are measured in the nickel-vanadium alloy system to monitor matrix composition and precipitate composition as a function of bulk composition and temperature. Coherency strains are expected to have a role in determining surface segregation. Local order near crystallographic surfaces is examined in copper-gold, Cu3Au, and compared to the bulk. %%% This research provides greater understanding of the factors that influence the surface and bulk microstructure and properties of materials.

使用复杂的 X 射线散射技术检查相干应变在相形成中的作用。 相形成的初始阶段涉及局部有序区域或簇的形成。 相干应变可以影响这些簇的组成并修改相图。 在镍钒合金系统中测量晶格参数，以监测基体成分和沉淀物成分作为整体成分和温度的函数。 相干应变预计在确定表面偏析中发挥作用。 检查铜金、Cu3Au 晶体表面附近的局域有序，并与块体进行比较。 %%% 这项研究让人们更深入地了解影响材料表面和体相微观结构和性能的因素。